REACTION KINETICS FOR OLEFIN HYDROGENATION OVER COBALT-MOLYBDENUM HYDROTREATING CATALYST AND MODEL STUDY OF CATALYST PROPERTIES

ABSTRACT

Over the years, several analytical methods have been applied to various heavy crude oil residua and their processed products to understand the chemistry behind residuum upgrading processes. The ultimate aim has been to predict prccessability of specific feeds. However, few, if any analytical methods have been found which adequately perform this task. This paper examines selected processing experiments by the following techniques – clusion chromatography with element specific detection, D 2007-80 with as-phaltene precipitation (SARA) separation, hydrogen distribution and incorporation by NMR – cusses whether the analytical technique has any potential to predict prccessability

From the size exclusion chromatography with element specific detection studies, an intimate relationship appears between the catalyst pore size and molecule size based on examination of the size behavior of feeds and pilot-plant products. From the D 2007-80 and asphaltene separations, the quality of asphaltenes appears to be related to the relative ease of processability of at least two different feeds. From the hydrogen distribution studies, hydrogen utilization was found to be feed dependent and could be directed by processing type. All these trends have some potential towards the formulation of a residuum processability scheme, however no method is as yet globally satisfactory.